See https://circleci.com/blog/sunsetting-1-0/: > TL;DR: After August 31, 2018, CircleCI 1.0 will no longer be available for Linux and macOS users. We're currently using CircleCI 1.0 for this project (/cc @neelance):  Need to deal with it by the time it's shut down. Options include: - migrate to CircleCI 2.0 (if it's still free) - migrate to another CI